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This is a ROPS type cab guard, which stands for Roll Over Protection, specifically made to fit the diecast Caterpillar D6 made by both Ertl and Norsot. I tried to make this fairy universal between the two, but due to slight variances, some minor sanding may be required to get the perfect match up to the diecast piece. The round rods in the piece are sprues simply there to try and prevent any warping during the printing or shippng process. I know that if there is some, a quick dip in warm water, then holding the piece how you want it to form will correct it for the most part. I also offer a 3 shank ripper and a set of tracks for this diecast piece as well. Should there be any questions, contact me via the designer link or direct via email to firstname.lastname@example.org